Sliding friction-tongs



s M No T m FT. NT Am GP. .G WN I 0w L S (No Modl.) I

No. 491,872. Patented Fe'bjl l, 189s.

Inventor.

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m: mums PETERS co. PHOTO-LHNQ, WASHINGTON, B4 c NITED STATES PATENTOFFICE.

CARLTON W. OANFIELD, OF WIN'IHROP, MINNESOTA.

SLIDING FRlCTlON-TONGS.

SPECIFICATION forming part of Letters Patent No. 491.872, dated February14, 1893.

Application filed October 19, 1892- Serial No. 449,385. (No model.)

T0 at whom it may concern.-

Be it known that I, CARLTON W. CANFIELD, a citizen of the United States,anda resident of Winthrop, in the county of Sibley and State ofMinnesota, have invented certain new and use ful Improvements in SlidingFriction-Tongs; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing bad to the accompanying drawings, and to letters of referencemarked thereon, which form a part of this specification.

Figure 1 of the drawings is a perspective view of the jaws with sectionof pipe. Fig. 2 is a perspective view of the yoke. Fig. 3 is a detailview of one of the jaws in perspective being a modification. Figs. 4 and5 are enlarged detail views of the grips or dies of the aws.

This invention has relation to certain new and useful improvements infriction tongs, and it consists in the novel construction andcombination of parts as hereinafter specified.

The particular object of the invention is to provide a device forlowering pipe or sand rods into wells, and which will be so constructedas to be capable of adjustment not only to different sizes of pipes orrods, but also to take up the wear caused by the friction of the pipe orrod.

In carrying out my invention, I provide two bars, designated by A, A, inthe accompanying drawings, the forward portions of which are each formedwith asemi-circular recess a, which together form the seat for the pipein the usual manner. These bars or jaws are connected at their forwardends by a head piece or yoke B, having therein a recess or aperture 1),in which said ends are held. The jaw A is secured therein by a bolt orpivot a, while the jaw A is loosely held therein by the two belts orpinsfand f, which are inserted in apertures g, g, of the head of thejaw, one near the extreme end, and the other near the inner edge. Thesepins or bolts do not pass through the yokeorhead piece, but are held oneabove and one below, as shown, allowing the jaw free play. The length ofthe opening I) is greater than the combined width of the jaws, so thatthe jaw A is adjustable toward and away from the jaw A, by means of aset-screw it, having bearings in said yoke and engaging a depression hon the head of jaw A. If desired, jaw A may also be adjusted by placingits pivot or bolt in the aperture is, instead of at o. By thisarrangement,it will be readily seen that the jaws may be quicklyadjusted, not only to take up wear, but to several different sizes ofpipes. mally allowing the pipe to pass slowly through them, they can bemade to securely hold the pipe to change a coupling; orin running sandrods into a well, this will hold the pipe firm without the use of asecond pair of tongs to keep it from turning as a section is added. Thismay also be used as pipe tongs or for screwing pipe together.

In Fig. 3, I have shown a modification wherein the bearing edges of thesemicircular recesses c are serrated or toothed.

The handle portions I of the jaws may be held together by a ring Islipped thereon.

Although the adj ustment above described will be sufficient tocompensate for the wear of the jaws, by the arrangement shown in Figs. 4and 5, I provide means whereby the grips or diesof the jaws may berenewed if desired, at any time. In the said figures, the semi-circularrecesses a are made larger than in the construction first described, andare formed with the grooves a therein.

L, L, are the grips or dies of semi-circular form,having their meetingfaces semi-circular to fit the pipe and formed with semi-circularhorizontal flanges l, which engage respectively the grooves ct in thejaws, in which grooves they are secured by means of pins Z. By removingsaidpins, the dies or grips may be readily removed and replaced.

Having described this invention, what I claim and desire to secure byLetters Patent 1. The tool for the purpose herein specified, comprisingthe parallel jaws A, A, having near their heads coincident semi-circularrecesses or seats, the yoke at right angles to said jaws, and in whichtheir heads are held, the jaw A being secured in said aperture looselyby an adjustable bolt or pivot, and the jaw A by means of bolts or pinsabove and below said yoke, and having a set screw provided with bearingsin said yoke and engag- Also that while noring a seat therein, wherebyit is adjustable toward and away from the jaw A, substantially asspecified.

2. The herein described friction tongs, comprising the parallel jaws A,A, adapted to contact with a pipe surface, the head piece or yoke B atright angles to said jaws, and having an aperture therein to receive theheads of said jaws, the jaw A being secured therein by a bolt or pivotpassing through the jaw and the head piece, the jaw A having a screwbearing thereon to adjust it toward and away from the jaw A, and anadjusting screw, substantially as specified.

3. The friction tongs, comprising the parallel jaws A, A, having each acorresponding semi-circular serrated recess adapted for contact with apipe surface, a head piece or yoke B at right angles to said jaws, andhaving therein a recess or aperture 6, in which the heads of said jawsare adjustably held, one of said jaws being free to move in said yoketoward and away from the other, and a set screw engaging said movablejaw through said yoke, substantially as specified.

4;. Theherein described friction tongs, comprising the parallel jaws A,A, having each a corresponding semi-circular recess therein, a groove ain the wall of each said recess, a semi-circular die or grip for eachjaw seated in said recess, and having a flange engaging said groove andremovably secured therein, a head piece or yoke Eat right angles to saidjaw, said head piece or yoke having an aperture b, in which the heads ofsaid jaws are loosely held, and a set-screw engaging one of said jawsthrough said yoke, substantially as specified.

In testimony whereof I aflix my signature in presence of two witnesses.

CARLTON W. GANFIELD.

Witnesses:

E. A. CAMPBELL, O. A. BENSON.

